Notable events involving Rys include:

2 Sep 1939Rys was detected and attacked by German aircraft and surface vessels. In all they dropped 26 depth charges. (1)

3 Sep 1939Rys received and executed an order to set a mine barrier (20 mines) 10 miles east from the tip of Hel Peninsula.

At night Rys was encircled by German minesweepers and submarine chasers and forced to dive. After few failed attempts of breaking out, Rys surfaced and attacked the surprised German crews by gunfire causing lot of confusion. She then escaped the area at full speed. (1)

4 Sep 1939Rys was attacked by German aircraft. The depth charges they dropped caused some damage, including a fuel leak. At night the submarine entered the Hela harbour for repairs. (1)

18 Sep 1939Rys entered Swedish coastal waters near the port of Stavn?s and was confined for the duration of the war. (1)